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Finding the Fourth Proportional to 18,995.20, 28,514.40 and 11,208.40

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Solution

The fourth proportional to 18,995.20, 28,514.40 and 11,208.40 is: 16,825.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.20 : 28,514.40 = 11,208.40 : x
  2. Step 2: Convert to fraction form
    18,995.20/28,514.40 = 11,208.40/x
  3. Step 3: Cross multiply
    18,995.20x = 28,514.40 × 11,208.40
  4. Step 4: Simplify right side
    18,995.20x = 319,600,800.96
  5. Step 5: Solve for x
    x = 319,600,800.96/18,995.20
  6. Step 6: Final answer
    x = 16,825.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.